We should be making sure that we're using valid disk names. The server is supposed to be responsible for making sure the length is 63 or less (COOPR-324), but per RFC 1123, its ok for a hostname to start with a digit so we'd have to do some cleaning before creating disks. Lowercasing everything and stripping leading digits should maintain uniqueness (at least within a Coopr system) because the cluster id and host number are present in the hostname.